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%     Created: Thu Jun 05 08:00 PM 2008 P
% Last Change: Thu Jun 05 08:00 PM 2008 P
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\begin{center}
   \fontsize{45}{60}\selectfont
   Multicast
\end{center}
\Huge
\indent{
Most messages sent over the Internet are sent by unicasting that
message: one computer sending the message to a specific computer. By
design, this message is not seen by any computers but the one to whom
the message is addressed. Distributing identical messages to many other
computers using unicast is inefficient because those messages may travel
the same path many times in reaching their destinations.
}

To take advantage of messages that would take the same paths, multicast
protocols were developed. Instead of sending messages to one computer,
multicast messages are sent to a group of computers (classified by a
shared address). Messages with that special address are duplicated as
they move through the Internet and passed on to any computer in that
addresss multicast group.

\end{document}


